No. It is Associated 300,000 weight oil. Steering under heavy throttle is nearly impossible, but if a tire gets loose the oil helps keep some power between the two. It helps quite a bit for crawling... Also if you manage it get a nice tight turn and a wheel picks up, it keeps power to both wheels. Steering definately lacks. You just have to adjust your driving style. It is definately not thick enough to lock the diff though. Slow speeds I don't notice a steering difference at all.

You need to use a screwdriver to scoop out the oil to put it into the diff case. It is really sticky stuff.

Yeah. I think it would be wise to clean the whole thing out. I just don't want to because it is still a new engine. I suppose I will though.

This is a quote from another forum. But this is in regards to rc18t. Uses a set screw to tighten/loosen the diff, but it is essentially the same thing as changing oil weights....

"Front diff:
looser:
More steering into corners (off power), too loose and steering may become inconsistant, and the truck may lose all steering coming out of the corner (understeer/push).

Tighter:
More stability when braking into corners, and more steering at the exit of the corner getting back on the power.

Rear Diff:
Looser:
More cornering traction, and steering into corner (off power), truck steers quicker into the corner. May oversteer getting back on the power at corner exit.

Tighter:
Truck will push (understeer) on power, and will have less overall traction while cornering.

The truck will be more forgiving to drive (and faster around a track) if the front diff. is a bit tighter than the rear. "


Just depends on how you want to drive. Since I don't really race, high speed turning is not that important to me.

Thrilsekr